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Influencing factors of 1Cr13 SSCC for oil gas wellhead

机译：油气井口1Cr13 SSCC的影响因素

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With the exploration of oil-gas field developing, more and more oil-gas well contain H2S, hydrogen sulfide stress corrosion has serious effect on production and restrict oil field development. With the applications of 1Cr13 steel in oil & gas wellhead, it is urgent to research hydrogen sulfide stress corrosion cracking (SSCC) properties in high-strength under the simulation condition of production. The tensile test under constant load and slow strain rate test (SSRT) were adopted to analyze the behaviors of 1Cr13 steel with orthogonal test under saturated H2S solution which included carbon dioxide under a partial pressure and its sample fracture was observed with SEM (Scanning Electron Microscope). Constant load tensile test is one of the first recognized by NACE to assess the performance of metallic materials against SSC approach under tensile stress in the aqueous solution which was in low pH value and H2S was saturated. Through the research above the mechanism of stress corrosion and the environmental factors that influence stress corrosion were investigated. The experimental results shown that the effects of environmental factors on SCC (Stress Corrosion Cracking) sensitivity of materials are in the following order: temperature effect > solution pH effect > chloride ion concentration effect, and 1Cr13 material has a better corrosion resistance for H2S and CO2 conditions under a certain stress so it can be proposed as the material of value for oil & gas wellhead. Through SEM it can be seen that the fracture is belonged to brittle fracture. The lattice bonding force is destroyed by hydrogen into the material that gathered in the certain crystal face and the material transform from plastic to brittleness, the material is failed, and SCC occurred.
机译：随着油气田的勘探开发，越来越多的油气井中含有H 2 S，硫化氢应力腐蚀对生产有严重影响，制约了油田的发展。随着1Cr13钢在油气井口中的应用，迫切需要在生产模拟条件下研究高强度硫化氢应力腐蚀开裂（SSCC）性能。采用恒压拉伸试验和慢应变速率试验（SSRT），通过正交试验对1Cr13钢在饱和H2S溶液中的行为进行分析，该溶液在分压下包含二氧化碳，并用SEM（扫描电子显微镜）观察其样品的破裂。 ）。恒定载荷拉伸试验是NACE首次认可的一种评估金属材料在低pH值和H2S饱和的水溶液中的拉伸应力下抗SSC方法性能的方法。通过以上研究，研究了应力腐蚀的机理和影响应力腐蚀的环境因素。实验结果表明，环境因素对材料应力腐蚀开裂的敏感性依次为：温度效应>溶液pH效应>氯离子浓度效应，而1Cr13材料对H2S和CO2的耐蚀性较好。在一定压力下的条件，因此可以作为油气井口的有价值的材料。通过SEM可以看出，该断裂属于脆性断裂。氢破坏晶格键合力，使之聚集在一定晶面上的材料中，并且材料从塑料转变为脆性，材料失效，并发生SCC。

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